What spool valve for log splitter?

[Breezeblock]

Not sure, reckon all will be well when it's piped in

just curious as you would expect a manufacturer to have a protection valve as standard

[john p]

just curious as you would expect a manufacturer to have a protection valve as standard

 

 

You'd have thought so, but when I flicked the lever over it stopped, it's had its oil cooler removed at some point so maybe ther was a valve involved with that somewhere

[WeFixIt]

Could you post a picture of the power pak?

 

 

Is it a chipper, is it a mower or another broken stump grinder who cares we'll fix it!

[Goaty]

We have one i bought off ebay. It has auto kick out at the top of the strokeIt works great unless someone puts the pipes in wrong way round on the tractor hydraulics or puts the lever wrong way. Just suggesting in case you pipes are not set to flow right.

[Breezeblock]

You'd have thought so, but when I flicked the lever over it stopped, it's had its oil cooler removed at some point so maybe ther was a valve involved with that somewhere

 

usually coolers are in the return circuit have you had a gauge on it to see what pressure its making

[WeFixIt]

Relief valves are also plumbed into the return circuit! So may of been removed along with the cooler!!!

 

 

Is it a chipper, is it a mower or another broken stump grinder who cares we'll fix it!

[openspaceman]

We have one i bought off ebay. It has auto kick out at the top of the strokeIt works great unless someone puts the pipes in wrong way round on the tractor hydraulics or puts the lever wrong way. Just suggesting in case you pipes are not set to flow right.

 

Apart from this problem of mistaking the feed and return pipes I consider it to be wrong to return the oil via the other port of a double acting spool being used as the feed because it causes an unnecessary flow retriction. This increases the losses, increases oil temperature and the back pressure can cause leaks around the spool O rings. Instead return to a zero back pressure point, preferably below the oil level.

[WeFixIt]

Apart from this problem of mistaking the feed and return pipes I consider it to be wrong to return the oil via the other port of a double acting spool being used as the feed because it causes an unnecessary flow retriction. This increases the losses, increases oil temperature and the back pressure can cause leaks around the spool O rings. Instead return to a zero back pressure point, preferably below the oil level.

 

 

What are you on about returning oil via the other port???

Unless your referring to the relief valve return port???

 

And there's no such thing as zero back pressure as the force pushing the oil flow back to the reservoir is the back pressure and any resistance on route increase the back pressure !!

 

 

 

 

Is it a chipper, is it a mower or another broken stump grinder who cares we'll fix it!

[agrimog]

it sounds very much like the power pack has a basic three way valve fitted, in one position the oil ciculates through the system bypassing the outlet and return circuits, in the other it goes to the outlet, and the retun comes back from whatever is connected in the circuit, if theres nothing in the circuit, selecting this will deadhead the pump, and either stall the motor(good thing, safety wise), or damage the pump,( usually caused by too big of a motor on the pump, bad component selection). and as Wefixit says, theres no such thing as zero back pressure in a hydraulic circuit, you put pressure into something, its got to go somewhere when it comes back out

[Goaty]

I know what you are saying openspaceman, resistance and all that.The freeflow return concept is simple and effective, we have it on a multivalved postknocker.

 

I have seen many pressurised valve blocks leak because of the lots of oil and not enough room to go anywhere quick enough.

 

If I understand what you are saying you recommend flow from tractor to valve then back from valve to transmission sump via a larger size hose and coupler, avoiding the pair of couplers partner which also has to return through the tractors valve block.

 

Our splitter operates on a compact tractor which does have a valve adjustment for double acting and single acting operations